Ext.Loader.setConfig({
   enabled: true,
   disableCaching: false
});

Ext.application({

   name: '${extApplicationName}',
   appFolder: 'app',
   models: ['Hello'],
   controllers: ['Hello'],

   launch: function() {
      Ext.get('loading').fadeOut();
      Ext.create('${extApplicationName}.view.Hello').show();
   }
});